Resistance of a given wire of length l is 4 ohm the wire is stretched uniformly
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The initial resistance is :-
R =resistivity × L/A
Resistance is directly proportional to length of wire.
Then the new resistance will be,
R' = resistivity × 3L/A
R= resistivity×L/A
After putting the value of initial resistance in the new resistance,,
R'= 3R
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